Former secretary Marian Carr Knox, 86, told the Dallas Morning News in a story posted on the paper’s Web site Tuesday that the memos at the center of a controversy over a CBS 60 Minutes report on the President’s National Guard service are fake, but she says they accurately reflect the thoughts of Bush’s superior officer, Lt. Col. Jerry Killian.

CBS identified Killian as the author of the four memos, one of which indicated the officer, who has since died, was under pressure to “sugar coat” Bush’s record.

Knox worked from 1956 to 1979 at what was Ellington Air Force
Base in Houston, where Bush was stationed as a pilot and Killian was her boss.

Knox told the Morning News that the memos are "not
real" and not what she would have typed for Killian.

She speculated the memos may have been constructed from memory
by someone who saw Killian's private file, but were not
transcriptions.

CBS continued to stand by its story Tuesday, in the face of mounting criticism.

Although the network says its analyst confirmed the authenticity of the memos, other experts question whether they could have been produced on a 1970s era typewriter and both Killian’s widow and son have said they doubt Killian wrote the memos.

Meanwhile Tuesday in Iowa, First Lady Laura Bush said she, too, thinks the documents are fakes.

"You know, they probably are altered," she said, "they probably are forgeries."